package cn.itcast.educenter.controller;

import cn.itcast.baseservice.exceptionhandle.GuliException;
import cn.itcast.commonutils.JwtUtils;
import cn.itcast.educenter.entity.UcenterMember;
import cn.itcast.educenter.service.UcenterMemberService;
import cn.itcast.educenter.utils.ConstantWxUtils;
import cn.itcast.educenter.utils.HttpClientUtils;
import com.google.gson.Gson;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

@Controller // 只是请求地址，不需要返回数据
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {
    @Autowired
    private UcenterMemberService memberService;

    // 2 获取扫描人信息，添加数据
    @ApiOperation(value="获取扫描人信息，添加数据")
    @GetMapping("callback")
    public String callback(String code,String state){
        try{
            //1 获取code值,临时票据，类似于验证码
            //2 拿着code请求 微信固定的地址，得到两个值 access_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token"+
                    "?appid=%s"+
                    "&secret=%s"+
                    "&code=%s"+
                    "&grant_type=authorization_code";
            // 拼接按个参数 id 秘钥 和 code 值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            // 请求这个拼接好的地址，得到两个返回值 access_token 和 openid
            // 使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            // 从accessTokenInfo 字符串获取出来两个值 access_token 和 openid
            //  使用Gson把accessToken字符串转成map集合，根据map里面key获取对应的值
            Gson gson = new Gson();
            HashMap accessTokenMap = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)accessTokenMap.get("access_token");
            String openid = (String)accessTokenMap.get("openid");

            // 根据openid去查询数据库中是否存在相同微信信息
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null) { //member是空，表没有相同微信数据，进行添加
                // 拿着得到的access_token 和 openid，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo"+
                        "?access_token=%s"+
                        "&openid=O%s";

                // 拼接参数
                String userInfoUrl = String.format(baseUserInfoUrl,access_token,openid);

                // 发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                // System.out.println(userInfo);
                // 把返回的用户信息的字符串，转化成HashMap
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                // 获取昵称和头像
                String nickname = (String)userInfoMap.get("nickname"); //昵称
                String headimgurl = (String)userInfoMap.get("headimgurl"); //头像

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);

                memberService.save(member);
            }

            // 使用jwt工具生成token
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e) {
            throw new GuliException(20001,"登录失败");
        }
    }

    // 生成微信扫描二维码
    @ApiOperation(value="生成微信扫描二维码")
    @GetMapping("login")
    public String getWxQrCode() {
        // 固定地址，后面拼接参数

        // 微信开放平台授权baseUrl %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect"+
                "?appid=%s"+
                "&redirect_uri=%s"+
                "&response_type=code"+
                "&scope=snsapi_login"+
                "&state=%s"+
                "#wechat_redirect";

        // 对redirectUrl进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try{
            redirectUrl = URLEncoder.encode(redirectUrl,"utf-8");
        }catch (Exception e){

        }

        // 设置%s里面的值
        String url = String.format(baseUrl,ConstantWxUtils.WX_OPEN_APP_ID,redirectUrl,"itcast");

        // 重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
